Add Pajamas-compliant empty state to `app/views/projects/no_repo.html.haml`
The `app/views/projects/no_repo.html.haml` template is rendered when a project exists without any source code (repository). We could use the [Pajamas-compliant empty state](https://design.gitlab.com/regions/empty-states#fallback) here in place of the current implementation: ![Screen_Shot_2022-02-09_at_4.17.05_pm](/uploads/2c1e2681a1d0ef2cf2ef322f03c0c6a1/Screen_Shot_2022-02-09_at_4.17.05_pm.png)
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